For which mechanisms the first step involved is the same ?
Correct answer: C. E1 and SN1
- A. E1 + E2
- B. E2 + SN2
- C. E1 and SN1
- D. SN1 and SN2
Explanation
E1 and SN1 reactions both begin with ionization of the carbon-halogen bond to form a carbocation, which is the slow, rate-determining step. They differ in the next step: elimination removes a proton, whereas substitution involves nucleophile attack. Students may choose SN1 and SN2 because both are substitution mechanisms, but SN2 has one concerted step and no carbocation.
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About Nucleophilic Substitution
Nucleophilic substitution replaces a leaving group in an alkyl halide when an electron-rich nucleophile attacks the carbon atom. The topic compares SN1 and SN2 mechanisms, including reaction conditions, substrate structure, solvent effects, nucleophile strength, carbocation formation and stereochemical changes, and distinguishes substitution from elimination.
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